docs: def promote_s3app(self):
          """promotes S3 deployment to LATEST"""
          utils.banner("Promoting S3 App")
          primary_region = self.configs['pipeline']['primary_region']
          s3obj = s3.S3Deployment(
              app=self.app,
              env=self.env,
              region=self.region,
              prop_path=self.json_path,
              artifact_path=self.artifact_path,
              artifact_version=self.artifact_version,
              primary_region=primary_region)
          s3obj.promote_artifacts(promote_stage=self.promote_stage)